[IE-MKLDNN] Facial Landmark examples don't work on IE backned

[Christywl]

Test Env:
Chromium Version: nightly build 79.0.3917.0 (74a844d)
Platform: Windows/Linux

Expected Result:
Facial Landmark examples should work.

Actual Result:
The position of key points are not accurate for Facial Landmark Detection:

How to Reproduce:

1. Setup test server and start
2. Launch chromium with IE backend(appending --use-inference-engine) and visit http://localhost:8080/examples/facial_landmark_detection/
3. Select FAST_SINGLE_ANSWER and unselect WASM
4. Select one model(except for Tiny Yolo v2)